1. adjusted to the correct musical pitch
2. adjusted or calibrated for optimal performance
3. set to receive a particular radio or television frequency

Examples

• The piano was perfectly tuned for the concert.
• Make sure your guitar is tuned before you start playing.
• The car’s engine was finely tuned for maximum efficiency.
• The radio was tuned to the local news station.
• Her voice was well-tuned and clear.
• The television wasn’t properly tuned to the channel.
• The mechanic said the engine needed to be tuned up.